Improvement in gas-meters



' SAMUEL eLnGo, or novas coir-AenooN'rY 'or sunniti', ENGLAND.

. To all whom it` may concern.;4

. Beit known that I, SAMUEL-Canne, of Dover g Cottage, Putney, in the county of Surrey, England, a subject of the Queen: of Great Britain,

have invented or discovered new and useful' Improvements in `Gras-Meters; andI, the said l SAMUEL GLEGG, do `hereby declare thatthe l nature ofthe said inventionand in what mani ner the-` same is to be performed are particularly described and ascertained in and by the following statement thereof-that is to say- This invention has for its object improvel ments in gasmeters. For these purposes, `in

l constructing the drum of a `gas-meter the i measuring-chambers are arrangedaround the periphery lof the drum .andfaspaceis left sur-` l rounding theaxis intowhich the unmeasnred 3 gas is supplied before itenters thc measuringchambers. ','Ihese chambers which-pass nearly `halffround the drum are open at both ends,

. theunmeasured `gas in the central space of the drum and serving to admit gas to the chamber, and the other end opening'ontside the vdrum and serving to discharge the measured gas into the casing surrounding the drum. The case of the drum and the drum itself are partly lled with water, the water in the one coml. municating with the water in the other by holes leftin the end plates of the drum around the axis. v These holes are covered by the The gas entering the chambers causes the drum to rotate, and the rotation of the drum allows a continuous flow of gasinto the casesurrounding, from which the gas is -led away from the meter to the burners.

In order that the accuracy of the meter may not depend on the level of the Water within it,

.p as this level is liable tobe disturbed by evap` eration and other causes, the drum has a ioat UNITED STATES one endfof each chamber communicating with water, so that the gas within the drum `cannot `bers forming the periphery of the.' drum.`

will be seen that one of the open ends of each PATENT Orricng IM PRovEMENT IN GAS-M ETE'Rs.

i e Specification forming part ofLetters Patent No. 32,049, dated April 16, 186i.

attached to it and is allowed to float uponbtlie water.V The bearings ofthe drum to admit of this are carried by levers, which are able to turn 4'freely on suitable centers. 'The Vfloat 1s placedin the interior ofthe drum, occupying a portion ofthe un measured gas-space Within it.

.This arrangement,however,would not alone insure accuracy, because if the pressure of .the

unmeasured gas is in creased while th at of the measured gas remains' constant some of the water would be driven out of the drum, winch would, consequently, float higher and disv chargemore gas of this higher pressure than .e

it'forrnerly discharged of the lower. To avoid this, the levers whichl carry `the axispf the4 drum are `continued beyond the centers on which they turn, and at their farther ends they have-attachedto them an inverted cup or vessel,open at the bottom, and into this vessel un- `measuredl gas is led by a pipe passing upinto it. `I-f thenfthe pressure of the unmeasured gas is increasedwhilc the pressure of the lneasf e ured gas is constant, this c up or .vessel tends to loatand'to depress the drun1,an d\as the areaof the cup or vessel andthe lengths of the arms of the levers are so proportioned that the upward tendency of the cup or vessel overbalances the upward tendency of the drum to such an `extent that the increasing or diminishing the pressure of the unmeasured gas but very slightly affects the water-line withinthe drum, the increasing the pressure causingthe drum to sink` deeper into the. water and the i water within it .to rise a little higher., so causing the drum to deliver a somewhat smaller measure of gasat the increased pressure,and this decrease of measure tends to compensate for the compression of the gas by the increase of the pressure.

In order that my said invention may be most fully understood and readily carried into effeet, I will proceed to describe the drawings hereunto annexed.

Inthe drawings, Figure 1 is a front View with the case removed. Fig. 2 is a back View,

partly in section. Fig. 3 isa horizontal section of a meter constructed according to my invention. Fig. 4 is a vertical section of the drum shown separately. y

a', a, as, a4, and a5 are the measuring-chan;- 

